Spark arrester



Mam 25 192% S. CHENEY SPARK ARRESTER Filed 13. 1922 Em. Z.

lrwenor Samuel Cheney /bywwwxm/M Patented ar. 25, 1924.

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errar SAMUEL CHENEY, OF G-UILDFOB-D, WESTERN AUSTRALIA, AUSTRALIA.

SPARK ARRESTER.

Application led .Tune 1,3, 1922. Serial No. 567,898.

` To @ZZ whom t may concern Be it known that I, SAMUEL CHENEY, of Guildford, in the State of Western Australia, in the Commonwealth of Australia, have invented an Improvement in Spark Arresters, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing' representing like parts. Y I

lFhis invention relates to improvements in spark arresters.

The invention particularly relates to iinprovements in spark arresters having an inverted curved gauze cone inserted in the path of the issuing gases and having the space between the top of the funnel and the top of the gauze cone closed by means of a ring of gauze integral with the said cone.

ln practical operation it has been found that there is a tendency for the sparks to work through the gauze ring before they are completely extinguished, and it is to completely prohibit injurious effects due to this tendency that the present invention has mainly been evolved.

The invention consists broadly in surrounding the aforesaid gauze ring with a bams member which is concentric with the ring and the funnel whereby a new combination is formed that eihciently arrests the Sparks.

To enable the invention to be more readily understood, reference will now be made to the accompanying sheet of explanatory drawings showing a preferred embodiment thereof.

1n the drawings Figure 1 is a side elevation showing the spark arrester attached to the funnel, portion of the baffle member being broken away for the sake of clearness.

Figure 2 is a sectional side elevation in which the means for holding the arrester to the funnel have been omitted; and

Figure 3 is a plan view.

Referring more particularly to the draw- 1n s:-

glhe funnel 10 having the flared top 11 is embraced by a ring formed of two halves 12 and 13 attached together by being iianged and bolted at two opposite points 14. A number of bolts 15 (preferably more, but not less than two) pass through holes, slots, or the like in the aforesaid ring and the upper portions of such bolts are each attached to a channel shaped bracket 16. The brack- `also directly connected to the outside of a hollow inverted truncated metal cone 1S open at both ends, the lower peripheral edge of the latter resting on the flared top of the funnel whilst the upper peripheral edge has attached thereto a ring of gauze 19. This ring of gauze is in the form of a hollow cylinder open at both ends, being supported by the hollow inverted truncated metal cone 18, and having attached to or formed integral with its upper peripheral edge a hollow inverted gauze cone 20. This hollow inverted gauze cone 2O is so arranged that its apex projects down into the funnel 10 and is in the path of the issuing gases. The gauze surface of the cone is curved inwardly towards the cone axis whilst the base thereof (at the top) is entirely' open and is not covered with gauze.

The tying down of the connected cone 20, ring 19, and inverted hollow truncated cone 18 to the funnel 10 is to prevent displacement under the influence of the exhaust steam.

A solid removable point 21 forms the apex of the inverted gauze cone. A number of L shaped supporting brackets 22 are fixed one to each channel shaped bracket 16. Surrounding the gauze ring 19 there is supported a baie member 23 that is conveniently, but not necessarily, concave in section, and which furthermore is of a somewhat larger diameter than the gauze ring. The baffle member 23 is connected by the bolts 24 and nuts 25 and thereby carried in operative position by the brackets 22.

The extent by which the diameter of the ring 19 should for the best results be lexceeded by the diameter of the baiiie 23 cannot be broadly formulated, depending as it f does on a number of variable factors such as type of funnel, steam pressure used, and the like. 1n any particular case, a few sirnple tests with varying sized bafiies will readily enable a determination to be arrived at.

The improved spark arrester operates as follows The exhaust steam carrying the sparks passes up the funnel 1() and strikes the inverted coned gauze 20 where the small sparks are extinguished whilst the steam passes i) il through into the atmosphere. The large sparks rebound from the coned gauzeV and strike the annular' ring 19 where most o them are broken and extinguished, whilst those not so broken are again dashed against the gauze on the next exhaust blast and are ultimately disintegrated. The small sparks that pass through the gauzel ring may not all be extinguished and herein lies the func* tion of the baille member which will prevent lateral movement of sparks that hit against it and will furthermore condense steam which will assist extinguishing.

In this specilication the word cone means a pointed figure having a base that is not necessarily circular. The word ring means a configuration which, if it had a top and bottom would enclose a space.

I claim- Y `l. ln a spark arrester, the combination with a funnel, of an inverted. gauze cone having its apex situated within the funnel, a gauze ring secured to the baseo'f the cone and depending therefrom, a filling ring connecting the lower edge of the gauze ring with the top of the funnel, and zin-annular baille encircling the gauze ring 'in spaced relation thereto, both the upper and the lower edges of said bailie'being separated from the gauze ring, whereby lateral movement of cinders and steam discharged from the ring is limited by the baille but free vertical movement either upward or downward is permitted through the annular spaces between the upper and lower edges of the baille and said gauze ring.

2. in a spark arrester, the combination c of an inverted gauze cone, a ring of'gauze attached to or integral with the saidV gauze' cone, and a baille supported in spacedrelationslnp to the gauze ring so as to hnnt lateral movement of cinders and steam dis# SAMUEL CHENEY. p 

